I've been playing around a bit with this format, and it's pretty fun so far. From what I've seen, Espeon and Mienshao feel like the top pokemon by far, with Pheremosa also being up there. I haven't seen Dracovish very often, but it seems good on paper. However, I think weather is something that is quite good and could use some exploration. I've been playing around with rain a bit and there are a surprising amount of abusers. Ludicolo, Manitine, and Carracosta and are all heavy hitters who outspeed just about everything with swift swim. As well, Weather Setting+Speed Boosting abilities being legal on the same team means you can easily set weather and have abusers ready. I haven't used sun or sand yet, but they both seem like they could be dangerous. Hail might even have a niche with Arctovish going crazy.